Hidraulic Pump - Learn How Hiraulic External Gear Motor Works

Hidraulic Pump



Hydraulic motors are powered by pressurized hydraulic fluid and transfer rotational kinetic energy to mechanical devices. Hydraulic motors, when powered by a mechanical source, can rotate in reverse direction and act as a (Hidraulic Pump) pump.

Operating specifications and features are the most important parameters to consider when searching for (Hidraulic Pump) hydraulic motors. The most important operating specification to consider when searching for (Hidraulic Pump)hydraulic motors is the motor type. Choices for motor type include axial piston, radial piston, internal gear, external gear, and vane. An axial piston motor uses an axially-mounted piston to generate mechanical energy. High pressure flow into the motor forces the piston to move in the chamber, generating output torque. A radial piston (Hidraulic Pump) hydraulic motor uses pistons mounted radially about a central axis to generate energy. An alternate-form radial piston motor uses multiple interconnected pistons, usually in a star pattern, to generate energy. Oil supply enters the piston chambers, moving each individual piston and generating torque. Multiple pistons increase the displacement per revolution through the motor, increasing the output torque. An internal gear motor uses internal gears to produce mechanical energy. Pressurized fluid turns the internal gears, producing output torque. An external gear motor uses externally-mounted gears to produce mechanical energy. Pressurized fluid forces the external gears to turn, producing output torque. A vane motor uses a vane to generate mechanical energy. Pressurized fluid strikes the blades in the vane, causing it to rotate and produce output torque. Additional operating specifications to consider for hydraulic motors include operating torque, operating pressure, operating speed, operating temperature, power, maximum fluid flow, maximum fluid viscosity, displacement per revolution, and motor weight. The operating torque is the torque the motor is capable of delivering. Operating torque depends directly on the pressure of the working fluid delivered to the motor. The operating pressure is the pressure of the working fluid delivered to the (Hidraulic Pump) hydraulic motor. Working fluid is pressurized by an outside source before it is delivered to the motor. Working pressure affects operating torque, speed, flow and horsepower of the motor. The operating speed is the speed at which the hydraulic motors’ moving parts rotate. Operating speed is expressed in revolutions per minute, or similar terms. The operating temperature is the fluid temperature range the motor can accommodate. Minimum and maximum operating temperatures are dependent on motor internal component materials, and can vary greatly between products. The power the motor is capable of delivering is dependent on the pressure and flow of the fluid through the motor. The maximum volumetric flow through the motor is expressed in terms of gallons per minute, or similar units. The maximum fluid viscosity the motor can accommodate is a measure of the fluid's resistance to shear, and is measured in centipoise. Centipoise is a common metric unit of dynamic viscosity equal to 0.01 poise or 1 millipascal second. The dynamic viscosity of water at 20 degrees C is about 1 centipoise.

The correct unit is cP, but cPs and cPo are sometimes used. The fluid volume displaced per revolution of the motor is measured in cubic centimeters (cc) per revolution, or similar units. The weight of the motor is measured in pounds or similar units. Additional features to consider when searching for hydraulic motors include mounting in any position, rated for continuous duty, and quiet operation.

Hidraulic Pump

Various Parts of Hydraulic Press Brakes (Hidraulic Pump)

Press brakes are used to make bends in thick heavy sheets and to make complex bends in thin materials. There are two types of press brakes: mechanical and hydraulic. Since a large amount of power is required to bend the sheets or plates, the hydraulic presses are usually more appropriate for each job. Hydraulic presses are available in capacities exceeding 50,000 metric tones. They are highly preferable in operations requiring steady pressure throughout the substantial stroke length, wide variations in the stroke length, and high or variable forces.

In order to fully understand the operation of a hydraulic press brake, you need to know how it works. Since hydraulic press brakes are made up of a number of components, keeping track of them all can be difficult. So, here is a basic list of some of the most prominent components.

1. Hydraulic fluid - Hydraulic fluid is transmitted through various parts of the machine. High pressure is exerted on hydraulic fluid by the hydraulic pump, thus creating highly energized fluid. This fluid then travels to the cylinders (actuators) where it delivers its stock of large amounts of energy to the piston, which operates the bending tools. After delivering the energy, the de-energized hydraulic fluid travels back to the pump to regain its energy and continue the operation of the machine. The hydraulic fluid is usually petroleum oil with various additives.

Apart from transferring the energy, the hydraulic fluid also lubricates the various components of the hydraulic press brake and removes the contaminants and metal fittings. The hydraulic fluid should be capable of operating at high temperatures, including a few hundred degrees Celsius, as it gets heated when it receives the energy in the hydraulic pump.

2. Hydraulic pump - The hydraulic pump actually produces the power that energizes the hydraulic fluid and transmits it through the machine to carry out the pressing operations. If a pump has the rating of say 5,000 psi, it can maintain the flow of liquid against the loads of 5,000 psi or it can apply that much pressure. The power density of hydraulic motors is ten times that of electric motors by volume. The hydraulic pump is operated by an electric motor or an engine connected by gears, belts, or flexible couplings. It can be a gear pump, vane pump, axial piston pump, or radial piston pump. The hydraulic pump is the "generator" side of the whole hydraulic press brake system.

3. Actuator - The power contained in the hydraulic fluid is delivered to the actuator, which carries out the pressing operation. There are various types of actuators, but the one used in hydraulic press brake is the hydraulic cylinder. The hydraulic cylinder is comprised of a cylinder barrel and a reciprocating piston. The large amount of energy contained in the hydraulic fluid is transmitted to the piston to carry out the linear work of pressing the metal sheets. The stroke length of the piston can be programmed to vary depending upon the thickness of the metal sheet and angle of the bend. The total stroke length of the piston depends on the length of the cylinder. The forces and pressure of the piston can be accurately controlled, and full pressure is available throughout the entire stroke. During the operation of the presses, the speed can be programmed to vary or remain constant. The hydraulic cylinder is the "motor" side of the whole hydraulic press brake system.

4. Control valves - The control valves direct the hydraulic fluid to the desired actuators. They control the amount of fluid and energy that is transmitted to the actuator. If there are multiple actuators, control valves distribute the fluid evenly among them as per the requirements of the operation.

And there you have it: the four main components in a hydraulic press brake. Now, you should be able to understand more fully the complete inner workings of a press brake system.

Michael Headingten, a machinist with a large shop, along with his 30 member team, runs contract work with the smaller metal working shops, making his combined machine count 3 press brakes, 5 brake press, 6 plate rolls, 2 angle rolls, and 6 hydraulic shears. He buys from E.G. Hellerson, knowing that the highest quality machines are Heller machines.

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Hydraulic Troubleshooting - Is it Difficult? (Hidraulic Pump)

The well designed and well manufactured Hydraulic machinery is very reliable; it is going to give you a lot of years of production without giving you trouble in most cases. This sounds good, but reality is that even you give your hydraulic machinery the best preventive maintenance, such as changing filters, oil on a regular basis, sometimes the machine is going to stop Typically, it will not be in a convenient moment, it may likely occur when you need it most, when you cannot stop production.

When you are facing a situation like this, the better prepared you are, the faster you are going to take your machine back working.

So, what do you need to do to perform a fast troubleshooting in your hydraulic machine that allows you to come back to normal?

I am going to discuss two different things, what to do before, and how to initiate some easy troubleshooting.

When I say before, I mean when the machine is working well, and you have time to work on the following:

• Learn Hydraulics. Yes, if you are not familiar with hydraulics, start from this point. If you want to resolve a problem fast, you need to learn how hydraulics works. If you have some knowledge, be sure of you know how all the hydraulic components work, how they handle FLOW, PRESSURE and DIRECTION. How all of them are connected to each other in your machine.

• Gather as much information related to the machine as you can, schematics, lists of components, manufacturers, catalogs, breakdowns, pressure settings and testing points.

• Familiarize with the machine, check the information you have gotten out, how many actuators (cylinders and motors), pumps and different valves the system have.

When the situation occurs - don't panic, and do the following:

• Talk to the machine operator; try to get as much information as possible in order to get a clear understanding about all the circumstances when the stop happened. Was it at the beginning of the cycle? In an intermediate point? Or which actuator was working when the machine stopped?

• Go back to the information about the machine you collected before. Check the hydraulic schematics, trace the path from the pump to the actuator, how many valves are there, what kind. Take into account that there are some components that are common for different movements or actuators, like pumps, relief valves, some directional valves, some flow controls.

At this point, after comparing notes you should have in your mind two or three or even more possible causes. Now is the moment to act. Let's say you have two possibilities, and then you need to think in how you are going to perform a test to disprove or confirm one of them. To do so, you need to isolate the hydraulic element and use a Flow meter with pressure gauge and load valve built in (relief valve). For example: if it is a pump you are trying to eliminate, you connect the flow meter direct to the outlet, start the machine and check the flow, first without load and then with it, closing the load valve. If the reading of the flow at max pressure (setting of the machine) is around 90% of the flow without load we can say that the pump is good, so the problem is caused by the other element.

Off course, all of the actions I described above are quite general, but the idea is that in order to discard or confirm that a hydraulic element is the cause; you need to follow the path from the pump to the actuator that stopped and perform the flow and pressure test adding an additional element like the relief valve after the pump, and so on until you get to the cylinder.

In brief, hydraulic troubleshooting is difficult but with the hydraulic knowledge, machine information and equipment (flow meter) is much easier and definitely much faster. The last one is relatively easy to get, the second one is easy depending on the manufacturer, and the first one is going to take more time but is the most worth it.

Note: If you do not have a Flow meter, you can use a 5 gal bucket to discharge the flow with a relief valve and gauge timing with a watch, for example: If the bucket is filled in 15 secs, the flow is 5 x 60/15 = 20 GPM.

Article written by Camilo Rueda. BS Mechanical Engineer, Universidad De Los Andes, Bogotá, Colombia 1980. IFP HS certified by The Fluid Power Society. USA 2003. With more than 28 years of experience in designing, manufacturing, repairing and troubleshooting of hydraulic systems.

Visit: More of hydraulics or How to learn Hydraulics.

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Hydraulic Pumps (hidraulic pump)

Hydraulic pumps(hidraulic pump) convert mechanical energy and motion into hydraulic fluid power and are usually powered by gas or electricity. However, hand and air driven pumps are also utilized. There are three main types of hydraulic pumps(hidraulic pump) used in the fluid power industry, namely vane pumps, gear pumps, and piston pumps. These are all positive displacement pumps, meaning that they transfer a calculated quantity of pressurized hydraulic fluid into a hydraulic system. This fluid progresses to the necessary component and its pressure is reconverted to mechanical force.

A general hydraulic pump(hidraulic pump) design can be further categorized into specific groups. For example, piston pumps can be radial, axial, in-line reciprocating, or axial bent-axis piston pumps. Vane pumps are either cam or sliding vane pumps. Pumps can be further subcategorized according to the modifications made for special applications. These pumps show a great variety in design. Irrespective of the design, all hydraulic pumps(hidraulic pump) are to be used with fluids of definite viscosity. Changes in fluid viscosity will cause altered performance, often lowering the efficiency. Most pumps get damaged by any solid particles in hydraulic fluid, and, hence, require a filtration system.

A hydraulic pump(hidraulic pump) is a very important component of construction, manufacturing, and machining equipment. It is responsible for a machine's precision, its efficiency, and overall performance of an entire system. Various materials are used in hydraulic pumps(hidraulic pump) to minimize wear and provide consistent performance. The type of material used varies according to pressures and temperatures that a hydraulic system will undergo. A number of plastics, synthetic rubbers, and steel alloys are used in the manufacturing of hydraulic pumps(hidraulic pump). High-strength alloys and polymers are used in high-pressure systems.

When choosing a pump, it is recommended to consider factors like operating pressure, temperature, and frequency. For applications requiring minimal pressures, less expensive, low-pressure pumps are available. Some examples of hydraulic pump(hidraulic pump) manufacturers are Lifco Hydraulics, Inc., Flint Hydraulics, Inc., HYSECO, Inc., and Craft Fluid Systems.

Pumps provides detailed information on Pumps, Water Pumps, Heat Pumps, Sump Pumps and more. Pumps is affiliated with Sun Powered Heat Pumps.

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